1
Tsutomu Yamate, Oliver C Mullins: Permanent optical sensor downhole fluid analysis systems. Schlumberger Technology Corporation, William B Batzer, David P Gordon, August 20, 2002: US06437326 (129 worldwide citation)

Systems for measuring the gas-oil ratio of fluid being produced in a wellbore are provided and generally include an uphole light source which produces a high amplitude near infrared signal at selected wavelengths, an uphole spectrometer, a processor coupled to the spectrometer for making GOR determi ...


2
Oliver C Mullins: Methods and apparatus for determining gas-oil ratio in a geological formation through the use of spectroscopy. Schlumberger Technology Corporation, Keith G W Smith, David P Gordon, August 17, 1999: US05939717 (103 worldwide citation)

Methods according to the invention include providing an OFA tool which subjects formation fluids to NIR illumination and which provides a spectral measurement of peaks at about 6,000 cm.sup.-1 and about 5,800 cm.sup.-1. The methods according to the invention also include calculating a ratio of the a ...


3
Christopher Harrison, Oliver C Mullins, Olivier Vancauwenberghe, Eric P Donzier, Akihito Chikenji, Anthony Robert Holmes Goodwin, Julian J Pop: Protective barriers for small devices. Schlumberger Technology Corporation, Matthias Abrell, Jaime Castano, Dale Gaudier, March 9, 2010: US07673679 (93 worldwide citation)

Protective barriers for small devices, such as sensors, actuators, flow control devices, among others, protect the devices from erosive and/or corrosive fluids, for example, formation fluids under harsh downhole conditions. The protective barriers include protective coatings and fluid diverting stru ...


4
Oliver C Mullins, Xu Wu: Method and apparatus for the downhole compositional analysis of formation gases. Schlumberger Technology Corporation, David P Gordon, Keith G W Smith, January 12, 1999: US05859430 (75 worldwide citation)

A borehole tool analyzes the composition of gases flowing from a formation. The tool includes an optical fluid analyzer (OFA) and a gas analysis module (GAM). The OFA determines when fluid flowing into the tool has become substantially only gas. The gas is then diverted to the GAM, thereby avoiding ...


5
Oliver C Mullins: Method of distinguishing between crude oils. Schlumberger Technology Corporation, David P Gordon, Leonard W Pojunas, November 30, 1993: US05266800 (72 worldwide citation)

Methods for distinguishing among oil samples, and more particularly between a fluid containing oil base mud and formation oil samples are described. The methods all rely on the discovery that the optical absorption spectrum of all crude oils in the visible and near infrared spectra can be described ...


6
Oliver C Mullins, Toru Terabayashi, Kazuyoshi Kegasawa, Ikko Okuda: Methods and apparatus for downhole fluids analysis. Schlumberger Technology Corporation, Robin Nava, William B Batzer, Brigitte L Jeffery, November 5, 2002: US06476384 (72 worldwide citation)

A method of determining GOR comprising subjecting a fluid to spectroscopic analysis at a first wavelength sensitive to gas and a second wavelength sensitive to oil, determining a response matrix for the contribution of gas at the first and second wavelengths and the contribution of oil at the first ...


7
Daniel R Hines, Noboru Wada, Stephen Garoff, Oliver C Mullins, Paul Hammond, Jeffrey Tarvin, Stephen P Cramer, Ralphe Wiggins: Method of analyzing oil and water fractions in a flow stream. Schlumberger Technology Corporation, Leonard W Pojunas, David P Gordon, July 19, 1994: US05331156 (69 worldwide citation)

Methods for quantifying the oil and water fractions of a fluid stream. A first method broadly includes making optical density (OD) measurements of the fluid stream by detecting photons of a first predetermined energy where the oil and water absorption characteristics are substantially identical (e.g ...


8
Jon J Schroer, Oliver C Mullins: Analysis of downhole OBM-contaminated formation fluid. Schlumberger Technology Corporation, William B Batzer, John L Lee, August 14, 2001: US06274865 (66 worldwide citation)

A method and apparatus is provided for determining OBM filtrate fraction in a downhole fluid sample. One embodiment of the method is used when there is significant difference between the coloration of formation fluid and the coloration of OBM filtrate. Another is used when there is little or no diff ...


9
Oliver C Mullins, Daniel R Hines, Masaru Niwa, Kambiz A Safinya: Apparatus and method for detecting the presence of gas in a borehole flow stream. Schlumberger Technology Corporation, Leonard W Pojunas, December 1, 1992: US05167149 (65 worldwide citation)

A borehole apparatus detects the presence of gas within a formation fluid sample. A light source transmits light rays to an interface between the fluid sample and the flow line. The interface reflects the light rays toward a detector array. The detector array detects light rays having angles of inci ...


10
Toru Terabayashi, Akihito Chikenji, Tsutomu Yamate, Oliver C Mullins, Andrew L Kurkjian, Hani Elshahawi: Methods and apparatus of downhole fluid analysis. Schlumberger Technology Corporation, Matthias Abrell, Jaime Castano, Dale Gaudier, December 9, 2008: US07461547 (60 worldwide citation)

Methods and apparatus for downhole analysis of formation fluids by isolating the fluids from the formation and/or borehole in a pressure and volume control unit that is integrated with a flowline of a fluid analysis module and determining fluid characteristics of the isolated fluids. Parameters of i ...